Information Notes are compiled for Members and Committees of the Legislative Council of Hong Kong. The Research Office has prepared this information note aiming to provide background information on (a) the International Technical Guidance developed by UNESCO; (b) the development of sexuality education in Hong Kong; and (c) the salient features of sexuality education in Singapore and Taiwan where different approaches have been adopted for implementing the related programmes. The information note also highlights the measures recently introduced in Ontario of Canada and England of the United Kingdom ("UK") to reform their respective sexuality education curriculum, in a move to cope with the societal changes and corresponding changes in sexuality education needs of their young people.